Correction lines exist in the rectangular survey system because:
Correct Answer
D) Meridians converge, so township widths shrink northward
Why this is correct: Correction lines exist because meridians converge, so township widths shrink northward. Since lines of longitude converge at the poles, a grid of townships based on them would narrow. Correction lines (also called standard parallels) are placed at intervals to reset the grid and maintain roughly six-mile-wide townships. Why the other choices are wrong: They are not due to states adopting different units. They are not due to systematic surveyor errors requiring fixing. They are not primarily due to rivers interrupting the grid. Exam tip: When you see a 'jog' in a section line on a map, it's often at a correction line, which accounts for the earth's curvature.
Why This Is the Correct Answer
Why this is correct: Correction lines exist because meridians converge, so township widths shrink northward. Since lines of longitude converge at the poles, a grid of townships based on them would narrow. Correction lines (also called standard parallels) are placed at intervals to reset the grid and maintain roughly six-mile-wide townships. Why the other choices are wrong: They are not due to states adopting different units. They are not due to systematic surveyor errors requiring fixing. They are not primarily due to rivers interrupting the grid. Exam tip: When you see a 'jog' in a section line on a map, it's often at a correction line, which accounts for the earth's curvature.
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